PUBLIC ADDRESSED SYSTEM

Introduction: PUBLIC ADDRESSED SYSTEM

THIS PROJECT IS PREFAREABLE FOR THOSE WHO ORGANIZED MEELAD SHARIF AT THIER HOME,,, ALSO FOR BIRTHDAY FUNCTIONS AND HOME PARTIES.. BECAUZE IT IS A 100 WATT P.A SYSTEM HAVING 2 EXTERNAL SPEAKERS AND A CARBON MIC.

PROJECT DISCRIPTION”

THIS PROJECT IS CONSISTING OF TWO INDIVIDUAL CIRCIUTS. THE 1ST ONE IS MICROPHONE PRE AMPLIFIER AND THE 2ND ONE IS STERIO POWER AMPLIFIER. BOTH CIRCIUTS ARE COUPLED BY DIRECT COULING METHOD.

BLOCK DIAGRAMOF P-A SYSTEM

DIFFRENCE BETWEEN PREAMPLIFIER AND AMPLIFIER”

A PREAMPLIFIER CANNOT AMPLIFIY, AND HAS NO SPEAKER CONNECTION WHILE AN AMPLIFIER CANNOT BE PROCESS T SOURCE METARIAL, AND CANNOT BE CONNECTED TO SOURCE DEVICE. A PREAPLIFIER IS USELESS WITHOUT AN AMPLIFIER.

MICROPHONE PREAMPLIFIER

Amicrophone preamplifieris asound engineering devicethat prepares amicrophonesignalto be processed by other equipment. Microphone signals are normally too weak to be transmitted to units such asmixing consolesandrecording devices.Preamplifiers increase a microphone signal to line-level (i.e. the level of signal strength required by such devices) by providing stablegainwhile preventing induced noise that would otherwise distort the signal.[1]

POWER AMPLIFIER

The term "power amplifier" is a relative term with respect to the amount of power delivered to the load and/or sourced by the supply circuit. In general a power amplifier is designated as the last amplifier in a transmission chain (theoutput stage) and is the amplifier stage that typically requires most attention to power efficiency. Efficiency considerations lead to various classes of power amplifier: seepower amplifier classes.

“CONSTRUCTION”

THIS PROJECT HAVE TWO AMPLIFIER CKTS WHICH ARE CONNECTED BY DIRECT COUPLING METHOD.A PREAMPLIFIER IS USE FOR MICROPHONE. INPUT IS GIVEN TO MICROPHONE AND THE OUTPUT WILL BE TAKEN BY LOUDSPEAKER. WE CAN SAY THAT MIC IS A INPUT TRANSDUSER AND LOUDSPEAKER IS A OUTPUT TRRANSDUSER. MIC IS CONNECTED AT THE INPUT SIDE OF THE PREAMPLIFIER AND THE SPEAKER IS CONNECTED AT THE OUTPUT SIDE OF POWER AMPLIFIER.

WORKING”

THE VCC OF PREAMPLIFIER IS 9-12VOLT AND THE VCC OF POWER AMPLIFIER IS 48VOLTS.AT THE INPUT SIDE MICROPHONE CONVERTS ACOUSTICAL SIGNAL INTO ELECTRICAL SIGNAL AND THE SIGNAL IS RUN FROM PREAMPLIFIER TO POWER AMPLIFIER. THE POWER AMPLIFIER AMPLIES THE INPUT SIGNALS IN TERMS OF VOLTAGE AND CURRENT. THEN THE AMPLIFIED SIGNAL IS REACHES AT OUTPUT TRANSDUCER CALLED SPEAKER.

OBSERVATIONS

SUPPLY VOLTAGE (POWER AMPLIFIER) = 24,24VOLTS

SUPPLY VOLTAGE (PREAMPLIFIER) = 9-12VOLTS

INPUT OF POWER AMPLIFIER = 0.8VOLTS

OUTPUT OF POWER AMPLIFIEER = 60VOLTS

TOTAL GAIN = 75

AMPARES OF CKT = 2AMP

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    2 Discussions

    0
    REHAN ZIA
    REHAN ZIA

    8 years ago on Introduction

    HI, FIRST OF ALL TAKE AN AMPLIFIER USING 2N3055 NPN TRANSISTORS 4 IN QUANTITY. THEN TAKE A MICROPHONE PRE AMPLIFIER FOR CONTROLING MIC SENSITIVITY. USE A TRANSFORMER OF 2 AMPARE AND 24 VOLT CENTRE TAPPED. USE PERFACT HEAT SINK FOR POWER TRANSISTOR. A 9 VOLT DC BATTERY FOR PRE AMPLIFIER. A 10K POT FOR CONTROLLING THE OUTPUT OF POWER AMPLIFIER..

    0
    thegeeke
    thegeeke

    8 years ago on Introduction

    Post instructions please. It looks like a fun project, but you need to tell people how to make it, otherwise it could be mis-understood as spam.